diff --git a/libs/plugins-runtime/src/lib/create-sandbox.ts b/libs/plugins-runtime/src/lib/create-sandbox.ts
index 9d03f9d..70c0248 100644
--- a/libs/plugins-runtime/src/lib/create-sandbox.ts
+++ b/libs/plugins-runtime/src/lib/create-sandbox.ts
@@ -118,8 +118,8 @@ export function createSandbox(
     // Window properties
     console: ses.harden(window.console),
     devicePixelRatio: ses.harden(window.devicePixelRatio),
-    atob: ses.harden(window.atob),
-    btoa: ses.harden(window.btoa),
+    atob: ses.harden(window.atob.bind(null)),
+    btoa: ses.harden(window.btoa.bind(null)),
     structuredClone: ses.harden(window.structuredClone),
   };